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INCOME TAXES - deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Accrued warranty costs | $ 9,424 | $ 17,945
Bad debt allowance | 7,019 | 7,288
Investment in affiliates under tax equity transactions |  | 24,859
Inventory write-down | 1,723 | 3,283
Future deductible expenses | 26,973 | 17,652
Depreciation and impairment difference of property, plant and equipment and solar power systems | 19,647 | 13,333
Accrued liabilities related to countervailing and antidumping duty deposits | 9,341 | 59,983
Deferred tax assets relating to sales of solar power systems | 481 | 2,721
Net operating losses carry-forward | 90,536 | 52,007
Unrealized foreign exchange loss and capital loss | 9,471 | 3,888
Interest limitation | 13,520 |
Others | 13,947 | 17,912
Total deferred tax assets, gross | 202,082 | 220,871
Valuation allowance | (76,522) | (65,399)
Total deferred tax assets, net of valuation allowance | 125,560 | 155,472
Deferred tax liabilities: |  |
Derivative assets | 2,697 | 2,742
Depreciation difference of property, plant and equipment | 1,212 | 243
Deferred profit of projects | 4,108 |
Insurance recoverable | 14,838 | 21,420
Others | 17,316 | 4,833
Total deferred tax liabilities | 40,171 | 29,238
Analysis as: |  |
Non-current deferred tax assets | 121,087 | 131,796
Non-current deferred tax liabilities | (35,698) | (5,562)
Net deferred tax assets | 85,389 | $ 126,234
Accumulated net operating losses | 541,928 |
Accumulated net operating losses subject to expiration between 2019 and 2038 | $ 144,586 |

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